EP3084521A1 - Système et procédé de projection d'image et afficheur utilisant ledit système - Google Patents
Système et procédé de projection d'image et afficheur utilisant ledit systèmeInfo
- Publication number
- EP3084521A1 EP3084521A1 EP14828183.5A EP14828183A EP3084521A1 EP 3084521 A1 EP3084521 A1 EP 3084521A1 EP 14828183 A EP14828183 A EP 14828183A EP 3084521 A1 EP3084521 A1 EP 3084521A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- image
- light beam
- signal
- image projection
- projection system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3016—Polarising elements involving passive liquid crystal elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2073—Polarisers in the lamp house
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3167—Modulator illumination systems for polarizing the light beam
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
Definitions
- the invention relates to an image projection system and a display using said system.
- the invention will find applications, for example, in motor vehicles to inform users of the vehicle, especially its driver.
- the brightness of the projected image is adapted to the ambient brightness.
- the optical power of the projected image be significantly different during a daytime trip and a night path or when passing through a tunnel.
- the invention aims to overcome at least some of the disadvantages of known image projection systems and displays.
- the invention also aims to provide an image projection system and a display that can effectively reduce the brightness of the light beam for forming an image.
- the invention also aims to provide, in at least one embodiment of the invention, an image projection system and a display that allow the attenuation of the brightness of said beam without deterioration of the quality of the projected image and displayed by the display.
- the invention relates to an image projection system, comprising a device for emitting a light beam, means for forming an image from said light beam, said image being decomposed into successively projected frames. by said system,
- said system comprises means for attenuating the optical power of the light beam, the attenuation means comprising:
- liquid crystal cell adapted to be driven by an alternating signal between two voltage levels, the cell providing a modification of the orientation of a polarization of the light beam under the control of the alternating signal
- a signal generator generating the alternating signal, said signal generator flipping said alternating signal from one voltage level to another between the projections of two successive frames of the image, means ensuring the variation of the optical power of the light beam according to the orientation of said polarization.
- a system according to the invention thus makes it possible to attenuate the light beam thanks to to attenuation means placed downstream of the existing transmission device, without modifications thereof.
- the attenuation means comprise a liquid crystal cell which allows, on command, to change the polarization direction of the light beam, which ensures the attenuation of the brightness of the beam.
- the liquid crystal cell is controlled by an electrical signal applied to the terminals of the liquid crystal cell, the voltage value of which changes the orientation of the polarization: the polarization and therefore the attenuation is a function of the absolute value of the voltage at the terminals of the crystal.
- the use of an alternating electrical signal between two voltage levels makes it possible to regularly modify the voltage value in order to avoid the very rapid deteriorations of the liquid crystal cell that occur if it is fed by a continuous signal.
- the alternation between the two voltage levels is between the projection of two frames of the image, to avoid any degradation of the image may pose security problems if the projection system is installed in a head-up display of vehicle.
- a plurality of frames may be projected between two alternations, and preferably only one frame is projected between two half cycles, ie the alternation takes place between each frame projection.
- the device for emitting the light beam comprises at least one laser diode.
- the device for emitting the light beam is a liquid crystal screen type cell comprising a thin film transistor, illuminated by a backlight.
- the laser diode is used alone for a monochromatic light beam, or in combination of three laser diodes for a conventional polyehromatic light beam.
- the liquid crystal display technology comprising a thin film transistor is commonly referred to as TFT-LCD (for Thin-Film Transistor Liquid Crystal Display).
- TFT-LCD Thin-Film Transistor Liquid Crystal Display
- the backlighting is generally performed by means of a light emitting diode (LED).
- LED light emitting diode
- the average of the AC signal voltage is zero.
- the life of the liquid crystal cell is improved over the use of a DC or AC alternative signal with a non-zero average which degrades the liquid crystal cell more rapidly.
- the two voltage levels are of equal absolute values and of opposite signs.
- the two voltage levels have the same absolute value, which makes it possible to obtain the same result in the direction of the polarization generated by the liquid crystal cell.
- the alternation of the signal does not modify the direction of the polarization, and therefore does not modify the attenuation of the light beam.
- the alternating signal is periodic.
- the frequency of the periodic alternating signal is equal to half the projection frequency of the frames of the image.
- the switching of the periodic alternating signal from one voltage level to another occurs between each frame projection.
- the invention also relates to a display, in particular a head-up display, comprising an image projection system according to the invention.
- a display according to the invention makes it possible to display the image projected by the image projection system.
- the display allows the driver of the vehicle to have in his field of vision of driving, vehicle and / or environmental information.
- the invention also relates to an image projection method, said method comprising a step of emitting a light beam and a step of forming an image from said light beam, said step of forming an image being decomposed into several successive image projection sub-stages, characterized in that said method comprises a step of attenuating the light beam by driving an alternating signal between two voltage levels, the tilting of the alternating signal a voltage level to another being controlled between the successive sub-stages of image projection frames.
- FIG. 1 is a schematic view of an emission device and attenuation means of an image projection system according to one embodiment of the invention, in several operating modes a), b) and vs),
- FIG. 2 is an example of a curve representing the optical power of the beam, expressed as a percentage on the ordinate, as a function of the voltage applied across a liquid crystal cell of a system according to the invention, expressed in volts on the abscissa. ,
- FIG. 3 is a time diagram representing the succession of frames (a) and the alternating signal (b) driving the liquid crystal cell of the attenuation means of the system according to the invention, as a function of time t on the abscissa,
- Figure 4 shows a schematic view of an image projection system and a head-up display according to the invention.
- the invention firstly relates to a projection system comprising a device 1 for emitting a light beam, intended to form an image .
- a device 1 for emitting a light beam intended to form an image .
- Such a device is more particularly intended to equip a head-up display of a motor vehicle, where at least one information related to the vehicle is projected.
- Said device comprises one or more sources 4, 5, 6 each emitting a beam 7, 8, 9 of the laser type.
- sources 4, 5, 6 each emitting a beam 7, 8, 9 of the laser type.
- laser sources typically laser diodes, each laser source emitting a monochromatic beam, that is to say consisting of a single wavelength.
- Said device here comprises a plurality of sources 4, 5, 6, in this case three, said device being configured to form the light beam 10 by means of pooling by combining the beams 7, 8, 9 individually. emitted by each of said sources 4, 5, 6. More specifically, it may be sources emitting a beam of a different color from one source to another. Colors are, for example, red, green, or blue (RGB).
- the optical power of each of the sources is controlled, independently, using the power supply of the laser source or sources.
- the color of the light beam 10 is determined by the way in which a power ratio is established between the different laser diodes. For example, to obtain a white light, the optical powers, in proportion, must be established according to the following distribution: 60 for the green diode, 30 for the blue diode, 10 for the red diode.
- the optical power of each of the sources can also be controlled to modulate the optical power of the light beam 10.
- the beams 7, 8, 9 emitted by each of the sources are oriented, for example, parallel to each other and reflected in the same direction to form by combination said common light beam 10.
- Said device 1 here comprises for this purpose semi-transparent optical elements, over a range of wavelength, such as dichro mirrors. or combining blades 11, intercepting the beams 7, 8, 9 emitted by each of said sources and combining them in the direction of said beam 10.
- said device 1 is configured to form said light beam 10 from said laser beam or beams 7, 8, 9, whatever the number of sources 4, 5, 6 involved.
- the light beam 10 is composed of the laser beam emitted by the only source used and the resulting image will then be monochrome, composed of the different levels of optical power applied to each of the points that compose it, according to a gradient of said color.
- said common beam 10 which then forms said light beam will allow the establishment of an image according to a color spectrum whose resolution will correspond to the fineness driving the supply of said sources 4, 5, 6.
- the image projection system comprises attenuation means 12 located downstream of said source or sources 4, 5, 6, making it possible to vary the optical power of the light beam 10.
- said attenuation means 12 make it possible to vary the optical power of the beam or beams 7, 8, 9, 10.
- it will be possible to adapt the optical power of the beam to daytime driving conditions and night driving conditions.
- Said device may include means for controlling the current supply of said sources. As mentioned above, they may allow a choice of the color of the light beam 10.
- control means are configured, for example, for linearly controlling the current of the optical power of said laser beams 7, 8, 9 so as to ensure said choice of color of the light beam 10, in a proportion of optical power attributed to each of said laser beams 7, 8, 9.
- Said control means may also be configured to provide additional adjustment of the optical power of said light beam. In this way, a particularly high attenuation rate can be achieved.
- control means are configured to provide pulse width modulation regulation of the optical power of said laser beams 7, 8, 9 so as to perform said additional adjustment of the optical power of said light beam 10, in particular according to an attenuation factor of between 5 and 20, in particular of about 10.
- Said control means comprise, for example, a microcontroller, not shown.
- said attenuation means 12 are configured to vary the optical power of the light beam according to an orientation of a polarization of said beam or beams.
- said attenuation means 12 comprise means 16 for modifying the orientation of the polarization of said beam (s) and, downstream, means for varying the optical power of said light beam (s). function of the orientation of said polarization, here an analyzer 17 transmitting only one of the components of the polarization of said beam or beams.
- the beam 10 has, before passing through the means 16 for modifying the orientation, an initial orientation 18.
- said means 16 for modifying the orientation of the polarization let the beam pass. without changing the orientation of its polarization and the orientation 13 obtained at the output of said modifying means allows a transmission approaching 100% of the beam through the analyzer 17.
- said means 16 for modifying the polarization orientation undergoes a polarization orientation change at a first angle and the orientation 14 obtained at the output of said modification means 16 allows transmission of 30% of the beam through the analyzer 17.
- said means 16 for changing the orientation of the polarization undergo a change of orientation of the polarization so that the new orientation 15 ob held is orthogonally shifted to the orientation of the polarization of the incident beam.
- the transmission of the beam through the analyzer 17 is then minimum, symbolized by the figure of 0%.
- the polarization orientation modification means 16 include, for example, liquid crystal means such as a liquid crystal cell.
- Said analyzer 17 is, for example, a polarizing film.
- the transmitting device may be composed of a liquid crystal screen comprising a thin film transistor (TFT-LCD for Thin Film Transisor Liquid Crystal Display).
- TFT-LCD Thin Film Transisor Liquid Crystal Display
- LED light-emitting diodes
- Such a device also provides a highly polarized light beam, due to the presence of polarization films in the liquid crystal screen.
- the polarization orientation modification means 16 are a liquid crystal cell 16.
- the liquid crystal cell 16 is driven by a signal generated by a signal generator 19.
- the variation of the The voltage provided by this signal across the liquid crystal cell 16 allows the adjustment of the direction of the polarization of the light beam 10 passing therethrough. In the context of the invention, this variation of the voltage therefore results in a variation of the optical power of the light beam 10, due to the attenuation thereof by the attenuation means 12.
- FIG. a graph illustrating an example of this variation of the optical power of the light beam 10, expressed as a percentage as a function of the absolute value of the voltage across the liquid crystal cell 16, expressed in volts.
- a conventional liquid crystal cell must be driven by an alternating signal. Indeed, the application of a continuous signal across a liquid crystal cell has the effect of significantly reducing the life of the latter. In addition, the application to a liquid crystal cell of opposite voltages, that is to say of the same absolute value but of different signs, makes it possible to obtain the same result in terms of attenuation. Thus, the signal can alternatively be varied.
- the image projected by the image projection system is in a manner known to those skilled in the art broken down into successively projected frames at a given projection frequency.
- a frame corresponds to a complete scanning of the screen by the light beam.
- the scanning means must return to its initial position during a reduced time interval during which no frame is projected.
- the alternation of the alternating signal between the two voltage levels is performed between two of these screen projections, during this time interval where the beam is not deflected on the screen by means of sweep as it returns to its starting position.
- FIG. 3b represents such an alternative signal used by the system according to the invention.
- the signal is represented by a curve 20, expressing the signal voltage as a function of time.
- This curve 20 is put in parallel with the succession of frames projected by the system, as a function of time (FIG. 3a).
- Four frames 22a, 22b, 22c, 22d are shown, and after each frame and before a new frame there is a time slot 24a, 24b, 24c, 24d, during which the scanning means returns to its initial position and therefore no frame is not displayed. It is at this point that the signal can alternate from one voltage level to another without degrading the image.
- alternation is performed between each frame projection, but the signal can alternately alternate every two, three, or x frames, as well as alternating irregularly and non-periodically.
- the alternating signal varies between a positive value and an opposite negative value in order to obtain a constant attenuation.
- the average of the AC signal voltage is zero. This further increases the life of the liquid crystal cell because a non-zero average is equivalent to using a non-zero continuous signal that damages the liquid crystal cell.
- the signal is periodic.
- a periodic alternating signal is more easily generated by a conventional signal generator known to those skilled in the art.
- the frequency of the signal is equal to half the frequency of projection of the frames.
- the projection frequency of the frames may be 60 Hz and the signal frequency may be 30 Hz.
- the signal represented by the curve 20 of FIG. 3b is therefore a signal according to an embodiment combining the aforementioned characteristics: it is a periodic signal of zero average and whose voltage levels + V and -V are opposite. Its frequency is equal to half of the frame projection frequency, that is to say that the alternation of one voltage level to another takes place between each frame projection.
- the signal represented by the curve 20 is a perfect square signal, which alternates directly between the two voltage levels and which takes as value only these two levels of voltage, without intermediate value. In practice, a square signal used in the invention can take negligible intermediate values for a limited time, during alternations from one voltage level to another.
- the invention also relates to a head-up display comprising an image projection system 100 according to the invention.
- the projection system 100 comprises, in addition to the device for emitting a light beam 1, means 102 for forming an image from said light beam 10.
- Said imaging means 102 comprise, for example, a scanning generator 110 whose function is to move horizontally and vertically the light beam 10 to provide a beam 103 performing a scanning frequency, in particular equal to 60 Hz, by way of non-limiting example.
- the scanning generator 110 comprises, for example, a scanning mirror with a micro-electro-mechanical system (hereinafter called MEMS mirror) on which the light beam 10 is reflected in a scanning beam 103.
- MEMS mirror micro-electro-mechanical system
- Such a MEMS mirror presents by example a diameter of 1 mm 2 .
- the MEMS mirror is able to rotate about two axes of rotation to perform a scan, for example at the refresh rate of 60 Hz, a diffuser screen 111 of said means 102 for forming an image. Said image is then formed on said diffuser 111.
- the MEMS mirror can be replaced by two plane and movable mirrors, whose movements are associated. One of these mirrors can be dedicated to a scan along a horizontal axis while the other mirror can be dedicated to a scan along a vertical axis.
- the diffuser 111 where the image is formed may be a transparent projection screen with a complex structure for projection by transparency. It can alternatively be translucent. It is made, for example, of glass, especially frosted, or polycarbonate.
- the diffuser screen is of the exit pupil type ("Exit Pupil Expander"). It allows to have an expanded observation cone. It extends in a plane traversed by the light beam, the image resulting from this scanning beam 103 being formed in the plane of a face of the diffuser screen 111.
- This diffuser screen receives the scanning beam 103. It is arranged to cause a dispersion of this scanning beam 103 according to an angular sector, for example, equal to 30 ° with respect to the direction of the scanning beam 103 at the moment when it comes to strike the diffuser screen 111.
- a face 112 of the diffuser screen is rough, in that it has asperities that cause the dispersion of the scanning beam 103.
- the rough face 112 corresponds to that by which the beam emerges, that is to say the face on which the image is formed.
- said image forming means do not comprise a scanning generator, as previously described, but a matrix of micro mirrors (also called Digital micro mirrors Systems).
- the image is formed at the level of the mirror array and then projected onto the diffuser screen.
- a projection optics is placed between the matrix and the screen.
- Each micro mirror corresponds to a pixel of the image.
- the image is not formed on the diffuser screen for the first time, but receives an image previously formed on the mirror array.
- said attenuation means 12 may be arranged upstream of said image forming means 102, as described in FIG. 1. They may still be downstream. In a variant, they may be placed between the scanning generator 110 or the micro-mirror array, on the one hand, and the diffuser screen 111, on the other hand.
- Said projection system may also comprise different mirrors 104, 106 planes or concave so as to focus the beams to the diffuser screen 111, placed in particular on the trajectory of the scanning beam 103.
- the invention also relates to a display, including a high head , comprising a projection system 100 according to any one of the variants detailed above. Downstream of the diffuser screen 111 in the direction of movement of the light beam, said display comprises at least one semi-reflecting plate 126 and a reflection device 125 interposed on the image path between the diffuser screen 111 and the semi-reflecting plate 126, the reflection device 125 comprising one or more plane or concave mirrors, as shown in FIG. 4.
- the path of the image is symbolized by three dotted arrows 30 which are reflected on the reflection device 125 before displaying through the semi-reflective plate 126.
- the latter allows a magnification and / or, by transparency, a display of the image beyond said semi-reflecting plate, in particular beyond the windshield of the vehicle equipped, at a virtual screen 130, obtained using said semireflecting blade 126.
- This transparent blade has a reflectivity of at least 20%, which allows the user to see through the blade the road taken by the vehicle, while enjoying a high contrast to see the image displayed.
- the display of the image can take place at the windshield of the vehicle equipped with said display.
- said attenuation means 12 may be located downstream of the image forming device 102, this up to said semi-reflective plate 126.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Projection Apparatus (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1303042A FR3015704B1 (fr) | 2013-12-20 | 2013-12-20 | Systeme et procede de projection d'image et afficheur utilisant ledit systeme |
| PCT/FR2014/000289 WO2015092166A1 (fr) | 2013-12-20 | 2014-12-18 | Système et procédé de projection d'image et afficheur utilisant ledit système |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3084521A1 true EP3084521A1 (fr) | 2016-10-26 |
| EP3084521B1 EP3084521B1 (fr) | 2020-08-05 |
Family
ID=50137718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14828183.5A Active EP3084521B1 (fr) | 2013-12-20 | 2014-12-18 | Système et procédé de projection d'image et afficheur utilisant ledit système |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US9880385B2 (fr) |
| EP (1) | EP3084521B1 (fr) |
| JP (1) | JP2017501449A (fr) |
| CN (1) | CN106462044B (fr) |
| FR (1) | FR3015704B1 (fr) |
| WO (1) | WO2015092166A1 (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9740004B2 (en) * | 2014-06-05 | 2017-08-22 | Making Virtual Solid—California LLC. | Pupil-expanded biocular volumetric display |
| US20180061449A1 (en) * | 2016-08-30 | 2018-03-01 | Bragi GmbH | Binaural Audio-Video Recording Using Short Range Wireless Transmission from Head Worn Devices to Receptor Device System and Method |
| FR3062490B1 (fr) * | 2017-02-02 | 2020-03-06 | Valeo Comfort And Driving Assistance | Dispositif de formation d'image et afficheur tete haute comprenant un tel dispositif |
| FR3065817B1 (fr) * | 2017-04-28 | 2020-10-30 | Valeo Comfort & Driving Assistance | Procede de pilotage d'un afficheur tete-haute et afficheur tete-haute |
| CN108152960B (zh) * | 2018-01-10 | 2020-05-15 | 京东方科技集团股份有限公司 | 车载平视显示方法及系统 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU1733195A (en) * | 1994-01-25 | 1995-08-08 | James L. Fergason | Display system and method |
| JPH09218460A (ja) * | 1996-02-08 | 1997-08-19 | Sharp Corp | 直線偏光照明系及び該照明系を用いた投射型表示装置 |
| US6476966B1 (en) * | 1999-12-15 | 2002-11-05 | University Of Central Florida | Continuously variable, wavelength-independent polarization rotator |
| US6525860B1 (en) * | 2000-05-18 | 2003-02-25 | Raytheon Company | Electronically variable light attenuator |
| JP2002214555A (ja) * | 2001-01-16 | 2002-07-31 | Canon Inc | 液晶薄膜光導波路を用いた画像形成装置 |
| US6962415B2 (en) * | 2004-02-27 | 2005-11-08 | Honeywell International Inc. | Electro-optical dimming system |
| EP1836532A4 (fr) * | 2005-01-12 | 2009-08-12 | Colorlink Inc | Systeme d'attenuation d'eclairage |
| US8864313B2 (en) * | 2009-06-15 | 2014-10-21 | Eastman Kodak Company | Dynamic illumination control for laser projection display |
| JP5842419B2 (ja) * | 2011-07-06 | 2016-01-13 | 日本精機株式会社 | ヘッドアップディスプレイ装置 |
| JP5978612B2 (ja) * | 2011-07-13 | 2016-08-24 | ソニー株式会社 | 照明装置および表示装置 |
| JP5910009B2 (ja) * | 2011-11-14 | 2016-04-27 | セイコーエプソン株式会社 | 液晶装置および電子機器 |
| US8746898B2 (en) * | 2012-05-07 | 2014-06-10 | Microvision, Inc. | Projector with shutter |
| US8860640B2 (en) * | 2012-05-30 | 2014-10-14 | Christie Digital Systems Usa, Inc. | Zonal illumination for high dynamic range projection |
-
2013
- 2013-12-20 FR FR1303042A patent/FR3015704B1/fr active Active
-
2014
- 2014-12-18 JP JP2016540969A patent/JP2017501449A/ja active Pending
- 2014-12-18 CN CN201480069877.4A patent/CN106462044B/zh active Active
- 2014-12-18 US US15/104,739 patent/US9880385B2/en active Active
- 2014-12-18 WO PCT/FR2014/000289 patent/WO2015092166A1/fr not_active Ceased
- 2014-12-18 EP EP14828183.5A patent/EP3084521B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP3084521B1 (fr) | 2020-08-05 |
| JP2017501449A (ja) | 2017-01-12 |
| FR3015704A1 (fr) | 2015-06-26 |
| US20170023788A1 (en) | 2017-01-26 |
| CN106462044A (zh) | 2017-02-22 |
| WO2015092166A1 (fr) | 2015-06-25 |
| US9880385B2 (en) | 2018-01-30 |
| FR3015704B1 (fr) | 2019-09-13 |
| CN106462044B (zh) | 2019-10-01 |
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